Question

Segmentation type motility that mixes lumen contents with digestive system secretions and continuously exposes the mixture to the epithelium for absorption to occur is common to what segment(s) of the alimentary tract?

All segments

small intestine (fed state only) and colon

pharynx and esophagus

pharynx, esophagus, and stomach

I think it's small intestine only but my classmates think it may be small intestine and colon

Answer 1

Answer

Option B) Small intestine (fed state only) and colon

• Small intestine is involved in absorption of all the nutrients digested and large intestine absorbs water from undigested matter.
• Segmentation contractions occurs in both small intestine and large intestine (colon).
• It is the back and forth smooth muscle contractions that allow mixing of the contents and expose them to the mucosa in order to facilitate absorption.
• It slows down the process of food propogation.